Fitting



March 14, 31959 TIDD 2,5@@,62E

FITTING F'iled April 6, 1946 3 Sheets-Sheet l March M, 195% E. B. THDD 25mm FITTING Filed April 6, 1946 3 Sheets-Sheet 2 K z; J5 jj J K25 J Y. 1 r 1 M, 150 E. B. TIDD g fi FITTING v Filed April 6, 1946 3 Sheets-Sheet 3 Patented Mar. 14, 1950 FITTING Edwin- E. 'liidd, Mount Prospect, 111., assignor to Bell-8. Gossett ilompany, Morton Grove, 111., a corporation of Illinois Application April 6, 1946, Serial N0. 660,172

' .6 Claims.

Myinvention relatesto fittings for hot water heating. systemsand is primarily concerned with a fitting that is constructed and arranged for attachment. to a varietyof boilers and which may be further arranged to segregate the air liberated from the water in the system boiler and to direct its collection'in the expansion tanls In the usual hot water heatingsystem, the supply line for the radiators leads from the top of the boiler and the expansion tank which accommodates pressure changes in the system is either connected directly to the boiler or another part of the system, or is tapped into the supply line. In passing through the boiler, the heat liberates air bubbles from the water which fiow to the top of the boiler and mingle with the hot water moving into the supply line. This air is trapped at the top of radiators or convectors, or in intervening pipe sections of the system, and hinders normal circulation with consequent reduction in the heating efiiciency of the system.

It is therefore one object of my invention to devise a fitting commonto the supply line and the expansion tank in which provision is made for directing to the supply line water that is substantially free from air bubbles and for directing the air bubbles to the tank.

A further objectis to provide a fitting which may or may not be characterized by the above features, but which in any case incorporates an adjustable arrangement enabling its attachment to various types of boilers.

These and further objects of the invention will be set forth in the iollowingspecification, reference being had'to the accompanying drawings, and the novel means by which said objects are effectuated will be definitely pointed out in the claims.

In the drawings:

Fig. i ispa diagrammatic, sectional elevation of a hot water heating boiler. showing one form of my improved fitting connected thereto.

Fig. 2 is an enlarged sectional view of the fitting shown in Fig. 1.

Fig. 3 is a view. similar to Fig. 2, but showing the fitting arranged for direct attachment to the boiler.

Fig. 4 is a fragmentary, sectional elevation of a boiler showing a further modification of the fitting which requires the separate attachment of the expansion tank to the boiler.

Figs. 5, 6 and 7 are sectional views showing variations of the fitting illustrated in Fig. 4.

Referring to Figs. 1 and2 of the drawings, the numeral iii designates a hot water heating boiler having the usual combustion chamber l l in which may be placed any type of firing means, and water legs l2l2 that. areconnected at the top by a water chamber l3 through which extend flues it that communicate by ducts (not shown) with the combustion chamber and a stack. The lower end of a nipple i5 is threaded in the upper Wall iii of the boiler and its upper end is connected to the lower branch ll of a T IS. A wall it extends transversely of the interior of the T 83 and-defines with the branch ii a chamber 726 from which laterally extends-a branch 2! in which is mounted one end ofa pipe 22-whose opposite end is connected to an expansion tank 23. The upper branch 2 3 of the T I8 is coaxial with the lower branch il and threaded in the former branch is the inlet end of a supply pipe 255 which conveys hot water to the radiators or other heating elements (not shown) and from which water is returned to the boiler through a pipe '26.

A tube 2i is slidablewith a substantially fluid tight fit through the wall is in coaxial and spaced relation to the nipple i5-and the pipe 25 and its upper and lower ends are flared as at 23 and 9, respectively, to maintain operative relation of the tube and the-T IS. The length of the tube fit is such that, when occupying the lowermost position shown in Fig. 2, its lowerend extends well below the lower end of the nipple to andthe lower end of the tube is cut on the bias as indicated by the numeral 3c in Fig. 2, both for reasons presently explained.

When the nipple i5 is mounted'in the topwall it of the boiler, the tube 21 is either shifted downwardly until the flare it engages the wall 59, or until its lower end abuts an interior portion of the boiler, such as a flue passage i i. In either case, the lower end of the tube is positioned below the zone in which collect air bubbles that are released from the water while passing through the boiler, this zone being disposed immediately below the top boiler wall it. Hence, water flowing to the supply pipe 25 is substantially free from air bubbles which avoids air trapping in the pipes and radiators of the heating system. The bias cut end 36 insures that if the tube 21 does abut an interior part of the boiler water may still flow freely into the tube. The air bubbles move upwardlybetween the nipple I5 and tube 27, and through the chamber '20 and pipe 22 and are eventually released in the tank 23.

The ability of the tube 2l-to slide relative to the'T l8 imparts a certain versatility to the fitting, since the lengthof the tube may be ar ranged to accommodate a variety of installations; Where the tube is longer than conditions require, the excess length is telescope'd within the pipe 25.

The construction shown in Fig. 3 is identical with that illustrated in Figs. 1 and 2, except that the T M, corresponding to the T i8, is threaded at its lower end 32 for direct mountingin the upper wall of the boiler, thus eliminating the nipple l5.

In Fig. 4 is illustrated a variant form of fitting designated by the numeral 33 which differs from that shown in Figs. 1 and 2 in lacking a lateral branch for connection to the expansion tank. The tank 34 must therefore be connected separately to the boiler 13, or may be connected to any other portion of the heating system. The lower end of the fitting 33 is threaded for direct attachment to the upper wall of the boiler while the upper end is fashioned for connection to the inlet end of the supply pipe which is coaxial with the fitting. The interior of the fitting is bridged by a transverse Wall 35, corresponding to the wall [9, and slidable through this wall is the tube 27 which is coaxial with the pipe 25. The use and advantages of this fitting, so far as the slip tube 21 are concerned, are identical with the form shown in Fig. 1.

The modifications illustrated in Figs. 5, 6 and 7 are variations of the form shown in Fig. s and each requires the separate attachment of the expansion tank to the system. In Fig. 5, the fitting 36 is identical with the fitting 33 except that the lower end of the former is connected to the boiler l3 by a nipple 31 as in Fig. 1; in Fig. 6, the fitting comprises a cup-shaped plug 31a Whose lower exterior is threaded at 38 for connection to the wall of the boiler l3 and whose interior is threaded at 39 for attachment to the inlet end of the supply pipe 25, the tube 27 being slidable through the bottom Wall of the plug 31a in coaxial relation thereto and to the pipe 25; and in Fig. 7, a nipple M is threadedly mounted at its lower end in the boiler wall and may be connected in any desired manned at its opposite end to a supply pipe (not shown). A bushing 42 is inserted in the lower end of the nipple 4! and slidable in the bushing is the tube 27.

The purpose of the tube 2'! is the same in all of the arrangements illustrated and as explained in connection with the form shown in Fig. 1.

I claim:

1. A fitting for a hot water boiler comprising a T having a pair of coaxial branches and a lateral branch, the coaxial branches being respec* tivel adapted for connection to the upper portion of the boiler and to a supply pipe leading to heating elements and the lateral branch being connectible to an expansion tank and communicating through the first named coaxial branch with the boiler, a transverse wall within the T separating the coaxial branches, and a tube slidable with a substantially fiuid tight fit through the wall Within the coaxial branches and in spaced relation to the first named coaxial branch and having a length sufiicient to extend a substantial distance below the top wall of the boiler.

2. A fitting for a hot water boiler comprising a T having a pair of coaxial branches and a lateral branch, the coaxial branches being respectively adapted for connection to the upper portion of the boiler and to a supply pipe leading to heating elements and the lateral branch being connectible to an expansion tank and communicating through the first named coaxial branch with the boiler, a transverse wall within the T separating the coaxial branches, and a tube slidable with a substantially fluid tight fit through the wall within the coaxial branches and in spaced relation to the first named coaxial branch and having a length sufficient to extend a substantial distance below the top wall of the boiler, one end of the tube being flared to engage the transverse wall for limiting slippage of the tube in one direction.

3. In a hot water heating system, the combination of a hot water boiler, an expansion tank, a conduit connecting the tank to the upper zone of the boiler in which collect air bubbles released from the water in the boiler, the bubbles passing through the conduit to the tank, supply pipe means for carrying hot water from the boiler to heating elements of the system, and a pipe portion telescopically extending in one direction within and in substantially fluid tight relation to the pipe means and in the opposte direction in spaced relation through the section of the conduit adjacent the boiler and the portion extendin into the boiler below said upper zone.

4. In a hot water heating system, the combination of a hot water boiler, an expansion tank, a T having a pair of coaxial branches and a lateral branch, one coaxial branch being connected to I,

the top wall of the boiler, a supply pipe leading to heating elements connected to the other coaxial branch, a conduit connecting the lateral branch and tank and providing communication through said one coaxial branch with the boiler, a transverse wall within the T above the lateral branch separating the coaxial branches, and a tube slidable with a substantially fluid tight fit through the Wall within the coaxial branches and in spaced relation to said one coaxial branch and having a length sufiicient to extend a substantial distance below the top wall of the boiler.

5. A fitting for a hot water boiler comprising hollow means having a pair of generally opposed branches respectively adapted for connection to the upper portion of the boiler and a supply pipe leading to heating elements, a guide member within the means, and a tube slidable with a substantially fluid tight fit through the member within the branches and having a length sufficient to extend a substantial distance below the top wall of the boiler, one end of the tube being flared to engage the member and limit slippage of the tube in one direction.

6. A fitting for a hot Water boiler comprising hollow means having a pair of generally opposed branches separated by an interior wall and a third branch extending laterall from the means, the opposed branches being respectively adapted for connection to the upper portion of the boiler and to a supply pipe leading to heating elements and the third branch being connectible to an expansion tank and communicating through the first named opposed branch with the boiler, and a tube slidable with a substantially fluid tight fit through the wall within the opposed branches and in spaced relation to the first named opposed branch and having a length sufficient to extend a substantial distance below the top wall of the boiler.

EDWIN B. TIDD.

REFERENCES ()ITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,511,056 Ercanbrack Oct. 7, 1924 1,824,422 Badger Sept. 22, 1931 2,343,856 Tidd Mar. '7, 1944 2,357,411 Leman Sept. 5, 1944 2,395,697 Tidd Feb. 26, 1946 

